| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] a | 37052 |
|
| 2 | could [vb infin] [art] | 12287 |
|
| 3 | could [vb infin] [art] | 12287 |
|
| 4 | could [vb infin] a | 4854 |
|
| 5 | could [verb] a | 4308 |
|
